Hi, I'm the original author. I put my address in the body of the message to
avoid spammers.
To answer your question, nobody answered my question. However,
after messing around, I found a change that did the trick. Coming from an OOP
background (lisp, smalltalk, etc.) it sure seems to me that PHP has a seriously
brain-damaged notion of objects and references.
Nevertheless, if you're a guest in someone's house you have to play by their
rules.
In this case, the rules are to use "=& new" instead of "= new" to create the
objects
in the first place. The new code below works as intended:
$apple = & new Org("Apple");
$banana = & new Org("Banana");
$cherry = & new Org("Cherry");
Also, please note there's a funny line-wrap in prettyprint(), but you can
remove the extra CR.
[EMAIL PROTECTED]
(but without the "-no-spam-please")
Joel Ricker wrote:
> I tried to ask this person if anybody answered his question personally or
> not but it appears the e-mail address isn't real ([EMAIL PROTECTED]). Understanable.
>
> Does anyone know about this or did anyone send em an e-mail about this?
> Just starting work on my first serious OOP project beyond a handful of basic
> classes and am interested in any information or problems associated with it.
>
> Joel
>
> : I'd like to ask your help to figure out why PHP objects are stripped of
> : their local variables when you add the objects to an array.
> : Shouldn't these be references, not shallow copies?
> :
> : The code below is a simple org chart.
> : I create three instances, each is added to a global array called orgs[].
> :
> : Each instance has a child, but when you add them to orgs[]
> : they lose their children.
> : I used & to create a reference, not a copy, but the problem remains.
> :
> : Please reply by email to [EMAIL PROTECTED],
> : but without the "-no-spam-please".
> :
> : When run in PHP Version 4.0.6, I get this output.
> : Notice that $apple retains its local value of $children,
> : but the same object, pushed onto $orgs[0], loses its local value.
> :
> : --- output web page----
> :
> : <Apple has 1 children >
> : <Banana has 1 children >
> : <Cherry has 1 children >
> :
> : <Apple has 0 children >
> : <Banana has 0 children >
> : <Cherry has 0 children >
> :
> :
> : ----------- source code ------
> : <?php
> : // A simple (buggy) Org chart package
> : global $orgs;
> : $orgs = array();
> :
> : class Org {
> : var $name;
> : var $children;
> :
> : function Org ($iname) {
> : global $orgs;
> : $this->name = $iname;
> : $this->children = array();
> : $orgs[] = & $this; // Each Org is added to the array $orgs[]
> : }
> :
> : function prettyprint() {
> : return "<".$this->name." has ".count($this->children)."
> : children >";
> : }
> : } // end class Org
> :
> : // Create three Orgs
> : $apple = new Org("Apple");
> : $banana = new Org("Banana");
> : $cherry = new Org("Cherry");
> :
> : // Arrange them hierarchically
> : $apple->children[] = $banana;
> : $banana->children[] = $cherry;
> : $cherry->children[] = "none";
> : ?>
> :
> : <html>
> : <body bgcolor=white>
> : <?php
> :
> : echo($apple->prettyprint()."<br>");
> : echo($banana->prettyprint()."<br>");
> : echo($cherry->prettyprint()."<p>");
> :
> : echo($orgs[0]->prettyprint()."<br>");
> : echo($orgs[1]->prettyprint()."<br>");
> : echo($orgs[2]->prettyprint()."<br>");
> : ?>
> : </body>
> : </html>
> :
> :
> : --
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